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Autophagy Alterations in White and Brown Adipose Tissues of Mice Exercised under Different Training Protocols
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Autophagy Alterations in White and Brown Adipose Tissues of Mice Exercised under Different Training Protocols
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Journal Article
Autophagy Alterations in White and Brown Adipose Tissues of Mice Exercised under Different Training Protocols
2024
Overview
Background: Autophagy is a conserved catabolic process that promotes cellular homeostasis and health. Although exercise is a well-established inducer of this pathway, little is known about the effects of different types of training protocols on the autophagy levels of tissues that are tightly linked to age-related metabolic syndromes (like brown adipose tissue) but are not easily accessible in humans. Methods: Here, we take advantage of animal models to assess the effects of short- and long-term resistance and endurance training in both white and brown adipose tissue, reporting distinct alterations on autophagy proteins microtubule-associated proteins 1A/1B light chain 3B (MAP1LC3B, or LC3B) and sequestosome-1 (SQSTM1/p62). Additionally, we also analyzed the repercussions of these interventions in fat tissues of mice lacking autophagy-related protein 4 homolog B (ATG4B), further assessing the impact of exercise in these dynamic, regulatory organs when autophagy is limited. Results: In wild-type mice, both short-term endurance and resistance training protocols increased the levels of autophagy markers in white adipose tissue before this similarity diverges during long training, while autophagy regulation appears to be far more complex in brown adipose tissue. Meanwhile, in ATG4B-deficient mice, only resistance training could slightly increase the presence of lipidated LC3B, while p62 levels increased in white adipose tissue after short-term training but decreased in brown adipose tissue after long-term training. Conclusions: Altogether, our study suggests an intricated regulation of exercise-induced autophagy in adipose tissues that is dependent on the training protocol and the autophagy competence of the organism.
Publisher
IMR Press
Subject
/ Adipose Tissue, Brown - metabolism
/ Adipose Tissue, White - metabolism
/ Age
/ Aging
/ Animals
/ atg4b
/ Autophagy-Related Proteins - genetics
/ Autophagy-Related Proteins - metabolism
/ Diabetes
/ exercise
/ Insulin
/ lc3b
/ Male
/ Mice
/ Microtubule-Associated Proteins - genetics
/ Microtubule-Associated Proteins - metabolism
/ p62
/ Physical Conditioning, Animal
/ Proteins
/ Resistance Training - methods
/ Sequestosome-1 Protein - genetics
